Elevator-lock.



D.'F. KILGOUR.Y

ELEVATOR LOCK.-

APPLICATION FILED SEPT. 29, 1914.

1,170,759; Patented Feb. 8, 1916.

Mam

iBIA PLANOGRAPH C0-. WASHINGTON D C taken on line 3-3 of Fig. 1; Fig. ,4 is aver- DWIGHT F. KILGOUR, OF LEXINGTON, MASSACHUSETTS.

ELEVATOR-LOCK.

T 0 all whom it may concern:

Be it known that I, DWIGHT F. KILGOUR, a citizen of the. United States, and a resident of, Lexington, Massachusetts, have invented an Improvement in Elevator-Locks,

of which the following description, in conbest understood by reference to the following description of an illustrative embodiment thereof shown in the accompanying drawing, wherein: V

Figure 1 is a plan of an illustrative elevator lock shown herein as embodying the invention; Fig. 2 is a side elevation of the lock; Fig. 3 is a vertical transverse section tical longitudinal section taken on line 4 4: of Fig. 1; Fig. 5 isa horizontal section through a part of the lock; and Fig. 6'is a detail to be referred to.

Referring to the drawing, the illustrative lock shown therein as embodying the invention comprises a bracket plate 1 having a lug 3 depending therefrom adapted to be threaded to an appropriate standard mounted on the elevator. Superposed on the plate 1 is a block comprising plates 5 and 7 said plates having'registering apertures permitting the passage ofv a shipper or controlling cable 9 therethrough. To facilitate .the guiding of the cable the plate 7 may have an upstanding collar 11 I with a flaring mouth. The plates may be secured together by lag screws 13, 13. I

The block described is adapted to contain jaws which may be opened or closed to cooperate with stops on the shippercable. As shown herein, bell crank jaws 15, 15 are provided pivoted on pins 17, 17 fast on said block, To transmit movement from one of the jaws to the other their short arms are pivotally connected by a'pin and'slot as at 19. The jaws are urged toward one another by a leaf-spring 21 having one end thereof fast in a kerf'in the block and its opposite Specification of Letters Patent.

Patented. Feb. 8, 191a.

Application nledSeptember 29, 1914. Serial No. 86 L178.

free end in engagement with theback ff.

one of the jaws. j I

An important feature of the invention relates to a simple and effective device for opening and closing the jaws. To, this end a disk-like cam 23. shown in detail in Fig. 6 is provided journaled' on apin 25 having a reduced end threaded into said block. This cam is formed to present an arc portion 27 of gradually increasing radius terminating in a substantially fiat portion 29.

Thecam is also formed to present a stop shoulder 31 for limiting the turning of the cam to open the jaws and a similar stop shoulder 33 for limiting the turning of the cam in closing the jaws. To turn the cam it is provided with a .hub 35 from which projects an operating handle 37. l r

. To conceal and protect the cam an ellipticlike plate 39 is provided conveniently'inte- 'gral withlugs 4.1 (Fig. 1) attached to the block by screws. This plate may serve as anindex for indicating the positions. of the handle for opening andclosing the jaws. As shown herein one end of the plate is marked with the word Open 7 and the other end is marked withthe .word Closed. One'of the jaws 15 hasan extension 43 projecting into the space formed between the v plate 39 and an end of the block. This projection is in line with'the cam 23 and adapt ed to be engagedthereby.

:is limited and its, appropriate position foropening the jaws is determined by the en gagement of the cam shoulder 31 with the upper surface of the jaw extension 43.

When-the cam is in this position the jaw "projection 1s pressed by its spring against the flat portion 29 of the'cam; Consequently there is no danger of the jaw operating on the cam to rotate the latter and permit closing of the jaws. When it is de-' sired to close the jaws the handle 37 is rocked in a clockwise direction (Fig. 2),

thereby releasing the jaws to the action of the spring 21 and closing the same as shown in Fig. 1. The turning of the cam to open the jaws is limited by the engagement of the shoulder 33 thereof with the under face of the jaw extension 43. When the cam shoulders 31 and 33 engage the jaw to limit the rotation thereof in opposite directions, the center of gravity of the cam is in a position substantially in the same horizontal line with and remote from the fulcrum point of the cam, but gravity tends to cause the cam to rock to a position in which the center of gravity thereof is vertically beneath said fulcrum. Consequently the cam tends to rock and maintain itself in its terminal positions with its shoulders in engagement with the jaw and tends to prevent inadvertent rotation of the cam. The handle arm 37 may project a substantial distance beyond the cam and further contribute'to the holding of the cam in its terminal positions.

It will be observed that both the opening and closing of the jaws are efi'ected through the instrumentality of a single operating handle and that its movements are clearly indicated on the index plate; also that by the merest casual glance at the device it will be at once apparent how the handle should be rocked to open or close the jaws. Thus the likelihood of accidents because of failure to appreciate how the device is operated is completely prevented.

The device is extremely simple and strong in construction and easily operated.

The jaws cooperate with the usual and well known pairs of stops which are located at intervals on the shipper cable. The jaws are closed when the elevator is at a floor level and are located between a pair of the stops. Since the block and standard are fast to the elevator it is impossible to shift the shipper cable until the jaws are opened. Thus any possibility of starting the elevator from a different floor level is prevented. After the elevator is completely loaded or unloaded the jaws are opened and then the shipper cable may be pulled from any floor level to start the elevator. After the elevator has been started by a passenger on the same the jaws may be closed and they will I automatically operate on their arrival between the pair of stops to shift the shipper cable and pull the same sufliciently to stop the elevator flush with the floor level.

Having described one illustrative embodiment of the invention without limiting the same thereto, what I claim as new and desire to secure by Letters Patent is:

1. An elevator lock comprising in combination, a block having a hole permitting the passage of a controlling cable therethrough, opposed bell crank jaws fulcrumed on said block and having pivotally connected arms,

spring means tending to close the aws, and means for opening the jaws comprising a cam pivoted on said block in front of said hole for engagement with one of said jaws and having a stop thereon for limiting the turning of the cam, a protecting plate connected to said block in front of said cam and, a handle for operating said cam, said plate having an index for indicating the positions of the handle for opening and closing the jaws.

2. An elevator lock comprising in combination, a block having opposed jaws fulcrumed thereon, and a hole permitting the passage of a controlling cable, means pivotally connecting said jaws, spring means tending to close said jaws, and means for opening said jaws including a cam piv oted on said block at the front of the block in advance of said hole for engagement with one only of said jaws, said cam having a stop for limiting the turning thereof and a handle for operating said cam.

3. An elevator lock comprising in combination, a member having jaws mounted. thereon, spring means tending to close said jaws, and means for opening said jaws including a pivoted cam having a curved jaw engaging portion, and a straight terminal jaw engaging portion for preventing inadvertent turning of the cam, said cam being mounted for movement in opposite directions, and means to prevent overthrow in each direction.

4i. An elevator lock comprising in combination, a member having opposed jaws mounted thereon, means for transmitting movement from one of said jaws to the other, spring means tending to close said jaws, and a cam pivoted on said member for engagement with one of said jaws and having stop shoulders for contact with opposite faces of said jaw to limit turning movements of said cam.

5. An elevator lock comprising in combi nation, a member having a hole for the passage of the controller cable and having jaws mounted upon said member, means for transmitting movement from one of said jaws to the other, spring means tending to a close said jaws, a pin secured to said mem her in front of said hole, a disk-like cam also in front of said hole and fulcrumed on said pin for engagement with one of said jaws to open said jaws, a handle fast to said cam, and a protecting plate interposed be tween said cam and handle and secured to said member.

6. An elevator lock comprising in combination, a block having a hole for permitting the passage of a controlling cable therethrough, jaw means 15, spring means 21 tending to close said jaw means, and an eccentrically fulcrumed cam 23 for opening said jaw means having stops 31 and 33 to engage the latter and positively limit rotation of said cam in opposite directions when the center of gravity of the cam is offset a substantial distance from the vertical line of the cam fulcrum.

7. An elevator lock comprising in combination, a block having a hole for permitting the passage of a controlling cable there-V through, jaw means 15, spring means 21 tending to close said jaw means, and means for opening said jaw means including a disk-like cam 23 having stops 31 and 33 for engagement with said jaw means to positively limit rotation of said cam in opposite directions, a handle 37 for rocking said cam and tending to hold said cam stops in engagement with said jaw means, and a shielding plate 39 between said handle and cam having provision for determining the opening and closing positions of the handle.

8. An elevator lock comprising in combination, a block having a hole permitting the I passage of a controlling cable therethrough, connected jaws fulcrumed on said block, spring means tending to close said jaws, means for opening said jaws comprising a cam pivoted on said block in front of said hole with its axis substantially normal to the axis of said hole, one only of said jaws extending into the path of movement of said cam, and means attached to said cam to turn the same in opposite directions.

In testimony whereof, Ivhave signed my name to this specification in the presence of two subscribing witnesses.

DVVIGHD F. KILGOUR.

Witnesses:

HENRY T. WILLIAMS, Ronnn'r H. KAMMLER.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. G. 

